Species tolerances and sample heterogeneities
Species tolerances and sample heterogeneities.
tolerance(x, ...)
## S3 method for class 'cca'
tolerance(x, choices = 1:2, which = c("species","sites"),
scaling = "species", useN2 = TRUE, hill = FALSE, ...)x |
object of class |
choices |
numeric; which ordination axes to compute tolerances and heterogeneities for. Defaults to axes 1 and 2. |
which |
character; one of |
scaling |
character or numeric; the ordination scaling to
use. See |
hill |
logical; if |
useN2 |
logical; should the bias in the tolerances / heterogeneities be reduced via scaling by Hill's N2? |
... |
arguments passed to other methods. |
Function to compute species tolerances and site heterogeneity measures from unimodal ordinations (CCA & CA). Implements Eq 6.47 and 6.48 from the Canoco 4.5 Reference Manual (pages 178–179).
Matrix of tolerances/heterogeneities with some additional
attributes: which, scaling, and N2, the latter of
which will be NA if useN2 = FALSE.
Gavin L. Simpson
data(dune) data(dune.env) mod <- cca(dune ~ ., data = dune.env) ## defaults to species tolerances tolerance(mod) ## sample heterogeneities for CCA axes 1:6 tolerance(mod, which = "sites", choices = 1:6)
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